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pamdeinterlace - remove ever other row from a PAM/PNM image
pamdeinterlace
[-takeodd] [-takeeven] N [infile]
You can use the minimum unique abbreviation
of the options. You can use two hyphens instead of one. You can separate
an option name from its value with white space instead of an equals sign.
pamdeinterlace Removes all the even-numbered or odd-numbered
rows from the input PNM or PAM image. Specify which with the -takeeven
and -takeodd options.
This can be useful if the image is a video capture
from an interlaced video source. In that case, each row shows the subject
1/60 second before or after the two rows that surround it. If the subject
is moving, this can detract from the quality of the image.
Because the
resulting image is half the height of the input image, you will then want
to use pamstretch or pnmscale to restore it to its normal height:
pamdeinterlace
myimage.ppm | pamstretch -yscale=2 >newimage.ppm
- -takeodd
- Take the odd-numbered
rows from the input and put them in the output. The rows are numbered starting
at zero, so the first row in the output is the second row from the input.
You cannot specify both -takeeven and -takeodd.
- -takeeven
- Take the even-numbered
rows from the input and put them in the output. The rows are numbered starting
at zero, so the first row in the output is the first row from the input.
This is the default. You cannot specify both -takeeven and -takeodd.
pamstretch(1)
, pnmscale(1)
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